S3 High Compression GAS Cylinder headRef : SPART00264A / 1011499

S3 Cylinder Head - High Compression GAS GAS (manufacturer part number: ST-1220-250-A): cylinder head insert designed for the trial/cross rider looking to refine their engine's behavior. Developed by S3, a specialist in trial and enduro parts, this high-compression insert modifies the chamber geometry to increase the compression ratio and optimize combustion while remaining suitable for demanding off-road use.

• Delivered with a short NGK BPMR6A spark plug and the necessary O-rings.
• Internal design optimized to promote a more efficient explosion and better throttle response.
• Helps to limit hot spots on the original cylinder head and contributes to better heat dissipation.
• Allows adjustment of engine behavior: more punch at low RPM, quicker revving, and improved traction feel depending on the chosen insert.

Choice of inserts: the standard version (STD) favors low-end torque; the high compression (A) provides a more responsive engine and better grip while riding; the AA/AAA levels are intended for specific setups or high altitudes; low compression inserts offer a softer response, favored by technical riders.

Compatible notably with GAS GAS TXT 250 models (Racing, GP, Pro). This part is intended for users looking to customize the mechanical mapping and engine character without modifying other components.